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Discovery of Alfvén waves planetward of Saturn's rings

Southwood, D. J., Cao, H., Shebanits, O., Elsden, T. , Hunt, G.J. and Dougherty, M.K. (2021) Discovery of Alfvén waves planetward of Saturn's rings. Journal of Geophysical Research: Space Physics, 126(2), 028473. (doi: 10.1029/2020JA028473)

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Abstract

Between April and September 2017 in the final stages of the Cassini Saturn Orbiter mission the spacecraft executed 22 orbits passing planetward of the innermost ring, the D-ring. During all periapsis passes oscillations were detected in the azimuthal magnetic field components on typical time scales of a few minutes. We argue that these time-varying magnetic signals detected on the spacecraft are also primarily time-varying in the plasma frame. Furthermore, we show that nearly all signals exhibit a spatial feature, namely a magnetic node near the effective field line equator. We propose that the oscillations are associated with Alfvén waves excited in local field line resonances, most likely driven from global sources.

Item Type:Articles
Additional Information:Funding: UKRI | Science and Technology Facilities Council (STFC). Grant Number: ST/N000692/1, UKRI | Science and Technology Facilities Council (STFC). Grant Number: ST/S000364/1, Leverhulme Trust. Grant Number: ECF-2019-155, UKRI | Science and Technology Facilities Council (STFC). Grant Number: ST/N000692/1, UKRI | Science and Technology Facilities Council (STFC). Grant Number: ST/S000364/1.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Elsden, Dr Thomas
Authors: Southwood, D. J., Cao, H., Shebanits, O., Elsden, T., Hunt, G.J., and Dougherty, M.K.
College/School:College of Science and Engineering > School of Mathematics and Statistics > Mathematics
Journal Name:Journal of Geophysical Research: Space Physics
Publisher:Wiley
ISSN:2169-9380
ISSN (Online):2169-9402
Published Online:15 December 2020
Copyright Holders:Copyright © 2020. The Authors.
First Published:First published in Journal of Geophysical Research: Space Physics
Publisher Policy:Reproduced under a Creative Commons Licence

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